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United States Patent |
5,237,128
|
Wuertz
|
August 17, 1993
|
Above-floor service fitting for poke-through wiring device
Abstract
A poke-through wiring device for mounting in a bore opening through a
concrete floor slab includes individual tubes for through-floor passage of
power supply and data/communication conductors, an intumescent barrier for
sealing the bore, and an above-floor service fitting having a main frame
including a bottom wall having spaced apart power supply and low voltage
data/communication openings therethrough. A pair of opposing sidewalls
extend upwardly from the bottom wall and each defines a plurality of
receptacle openings. A unitary receptacle barrier mounted on and
cooperating with the frame isolates the power supply opening, at least one
receptacle opening in one of the sidewalls and at least two of the
receptacle openings in the other of the sidewalls from the
data/communication opening. An auxiliary frame may be connected to the
main frame to increase the number of available receptacle openings.
Inventors:
|
Wuertz; Emil S. (Madison, CT)
|
Assignee:
|
Hubbell Incorporated (Orange, CT)
|
Appl. No.:
|
766131 |
Filed:
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September 27, 1991 |
Current U.S. Class: |
174/48; 174/53 |
Intern'l Class: |
H02G 003/22 |
Field of Search: |
174/48,49,53
52/220.8
|
References Cited
U.S. Patent Documents
3110754 | Nov., 1963 | Witort et al. | 174/48.
|
4243835 | Jan., 1981 | Ehrenfels | 174/48.
|
4272643 | Jun., 1981 | Carroll et al. | 174/48.
|
4323723 | Apr., 1982 | Fork et al. | 174/48.
|
4336416 | Jun., 1982 | Goodsell | 174/48.
|
4496790 | Jan., 1985 | Spencer | 174/48.
|
Primary Examiner: Picard; Leo P.
Assistant Examiner: Tone; David A.
Attorney, Agent or Firm: Presson; Jerry M., Haesche; Frederick J.
Claims
I claim:
1. In a poke-through wiring device having an above-floor service fitting, a
through-floor fitting for positioning in a bore opening through a floor
slab or the like and including conduit means for passage therethrough of
power supply and low voltage conductors, and fastening means for securing
the service fitting to the through floor fitting, the improvement wherein
said service fitting comprises a main frame including a bottom wall having
spaced apart power supply and low voltage openings therethrough and a pair
of opposing sidewalls extending upwardly from said bottom wall, each of
said sidewalls defining a plurality of openings for electrical
receptacles, a unitary receptacle barrier, and means for releasably
securing said receptacle barrier in assembly with said main frame, said
receptacle barrier cooperating in assembly with said main frame to isolate
from said low voltage opening said power supply opening and at least one
of the receptacle openings in one of said sidewalls and a plurality of the
receptacle openings in the other of said sidewalls.
2. In a poke-through wiring device as set forth in claim 1 the further
improvement wherein said receptacle barrier cooperates with said frame to
isolate three of said receptacle openings from said main low voltage
opening.
3. In a poke-through wiring device as set forth in claim 1 the further
improvement wherein said receptacle barrier cooperates with said main
frame to isolate a plurality of said receptacle openings in said one of
said sidewalls from said low voltage opening.
4. In a poke-through wiring device as set forth in claim 3 the further
improvement wherein said receptacle barrier cooperates with said frame to
isolate four of said receptacle openings from said low voltage opening.
5. In a poke-through wiring device as set forth in claim 1 the further
improvement comprising an auxiliary frame having a bottom wall and a pair
of opposing auxiliary frame sidewalls, said auxiliary frame sidewalls
defining a plurality of receptacle openings, and attaching means for
securing said auxiliary frame in end to end relation to said main frame to
form an extension of said main frame.
6. In a poke-through wiring device as set forth in claim 5 the further
improvement wherein said receptacle barrier isolates said power supply
opening and all of said receptacle openings defined by said main frame
from said low voltage opening.
7. In a poke-through wiring device as set forth in claim 5 wherein said
main frame has a pair of opposing end walls and said auxiliary frame has a
pair of opposing end walls and said attaching means comprises means for
connecting one end wall of said main frame to an associated end wall of
said auxiliary frame.
8. In a poke-through wiring device as set forth in claim 7 the further
improvement wherein at least said one end wall of said main frame and said
associated end wall of said auxiliary frame have a lower profile than said
sidewalls.
9. In a poke-through wiring device as set forth in claim 7 the further
improvement wherein at least said one end wall of said main frame and said
associated end wall of said auxiliary frame have a lesser width dimension
than said bottom wall of said main frame and said bottom wall of said
auxiliary frame.
10. In a poke-through wiring device as set forth in claim 1 the further
improvement wherein said receptacle barrier has a top wall and a plurality
of intersecting dividing walls depending from said top wall.
11. In a poke-through wiring device as set forth in claim 10 the further
improvement wherein said top wall has a generally L-shape as viewed from
above.
12. In a poke-through wiring device as set forth in claim 10 the further
improvement wherein said top wall has a generally U-shape as viewed from
above.
13. An above-floor service fitting for attachment to a through-floor
fitting in a poke-through wiring device, said service fitting comprising a
frame having a bottom wall defining a power supply opening and a low
voltage opening spaced from said power supply opening, a pair of opposing
sidewalls extending upwardly from said bottom wall, each of said sidewalls
defining a plurality of separate receptacle openings, a unitary receptacle
barrier, and attaching means for releasably securing said receptacle
barrier in assembly with said frame, said receptacle barrier in assembly
with said frame cooperating with said bottom wall and said sidewalls to
isolate from low voltage opening said power supply opening and at least
one of said receptacle openings in one of said sidewalls and at least two
of said receptacle openings through the other of said sidewalls.
14. An above-floor service fitting as set forth in claim 13 the further
improvement wherein said service fitting isolates at least two of said
receptacle openings in said one wall from said low voltage opening.
15. An above-floor service fitting as set forth in claim 13 wherein said
receptacle barrier includes a top wall and a plurality of intersecting
dividing walls depending from said top wall.
16. An above-floor service fitting as set forth in claim 15 wherein said
top wall has a generally L-shaped configuration as viewed from above.
17. An above-floor service fitting as set forth in claim 15 wherein said
top wall has a generally U-shaped configuration as viewed from above.
18. An above-floor service fitting as set forth in claim 13 wherein said
frame has a pair of opposing end walls and said attaching means comprises
means for securing said receptacle barrier to an associated one of said
end walls.
19. An above-floor service fitting as set forth in claim 13 including
connecting means for releasably securing said service fitting to said
through-floor fitting.
20. An above-floor service fitting as set forth in claim 19 wherein said
connecting means comprises a pair of key slots formed in said bottom wall.
Description
BACKGROUND OF THE INVENTION
This invention relates in general to wiring devices and deals more
particularly with improvements in above-floor service fittings for
poke-through wiring devices which include power supply and low voltage
service. A wiring device of the type with which the present invention is
concerned is particularly adapted for anchoring within a bore formed in
and opening through a concrete floor slab or the like to provide for
passage through the slab of power supply and low voltage
data/communication conductors which terminate at associated receptacles
mounted on an above-floor service fitting which comprises part of the
device.
Current popularity of open space offices utilizing modular work stations
having state-of-the-art voice/data communication equipment has created
need for improved poke-through wiring devices to accommodate varying
arrays of power supply and low voltage receptacles at above-floor
locations. The number of receptacles including power supply receptacles
and low voltage data/communication outlets provided at a given location
will, of course, be determined by the requirements of the equipment to be
accommodated at that location, but generally, the number of low voltage
data/communication outlets required at a given workstation will exceed the
number of power supply receptacles required at that station.
Safety requirements generally dictate that an above-floor service fitting
for accommodating both low voltage and power supply conductors be provided
with an internal divider to separate power and low voltage wiring, so that
the low voltage terminations within the fitting may be safely serviced
without risk of accidental contact with the power supply terminations.
Accordingly, it is the general aim of the present invention to provide a
poke-through wiring device having an improved above-floor service fitting
enabling varying arrangements of power supply and low voltage receptacles
which are isolated from each other to satisfy the aforesaid requirement
and which may be readily expanded to accommodate system growth.
SUMMARY OF INVENTION
In accordance with the present invention, an above floor service fitting
for a poke-through wiring device includes a frame having a bottom wall
defining separate, spaced apart power supply and low voltage openings for
passage therethrough of power supply and low voltage conductors and a pair
of opposing sidewalls which extend upwardly from the bottom wall and
define a plurality of individual receptacle openings. A unitary receptacle
barrier mounted on and cooperating with the frame isolates the low voltage
opening from the power supply opening, at least one of the receptacle
openings in one of the sidewalls and a plurality of the receptacle
openings in the other of the sidewalls, whereby a low voltage receptacle
mounted on the above-floor service fitting may be serviced without risk of
accidental contact with power supply conductors.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an exploded perspective view of a poke-through wiring device
embodying the present invention.
FIG. 2 is a plan view of the wiring device of FIG. shown with the cover
removed and portions of the receptacle barrier broken away to reveal
structure thereunder.
FIG. 3 is a somewhat enlarged fragmentary sectional view taken along the
line 3--3 of FIG. 2.
FIG. 4 is similar to FIG. 3 but shows an auxiliary above-floor service
fitting attached to the device.
FIG. 5 is a somewhat enlarged fragmentary sectional view taken along the
line 5--5 of FIG. 4.
FIG. 6 is similar to FIG. 2, but shows another poke-through wiring device
embodying the invention.
FIG. 7 is a perspective view of the receptacle barrier shown in FIG. 6.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENT
Turning now to the drawings and referring first particularly to FIGS. 1-3,
a poke-through wiring device embodying the present invention and indicated
generally by the reference numeral 10 is particularly adapted for mounting
within a bore opening through a concrete floor slab or the like (not
shown) to provide for passage through the slab of both power supply and
low voltage conductors, in a manner well known in the art. The device 10
includes an above-floor service fitting, indicated generally at 12, for
receiving and supporting a plurality of receptacles of differing types
(not shown) used to terminate the various power supply and low voltage
conductors. The device also has a through-floor fitting, best shown in
FIG. 1 and designated generally by the numeral 14, for mounting in fixed
position within the floor slab bore and upon which the service fitting 12
is mounted. The multi-service fitting 12 is compartmentalized and includes
a frame indicated generally at 16, a receptacle barrier designated
generally by the numeral 18, for isolating power supply receptacles which
terminate the power supply conductors from those receptacles which
terminate low voltage voice/data communication conductors, and a cover 20,
all of which will be hereinafter further discussed.
Considering now the wiring device 10 in further detail, the above-floor
service fitting 12 is particularly adapted for use with poke-through or
through-floor fittings such as the PT7XC and the 2 inch PT27 Poke-Through,
produced and marketed by Hubbell, Inc., Orange, Conn. 06477, assignee of
the present invention. The through-floor fitting 14, shown in FIG. 1, is
typical of such fittings and comprises a stationary fire barrier which
includes at least one intumescent disc 22 for generally complementing an
associated portion of a floor slab bore opening in which it is received.
However, the illustrated stationary fire barrier has a plurality of discs
22,22 sandwiched between plates which include an upper plate 24 and a
lower plate 26. A pair of axially elongate poke-through tubes or conduits
which include a power supply tube 28 and a low voltage or
telecommunication tube 30 are integrally connected to and extend for some
distance above the upper plate 24, substantially as shown. Lower portions
of the conduits 28 and 30, designated 28' and 30', depend from the lower
plate 26 and support an adjustable fire barrier 31 preferably made from
intumescent material. Generally diametrically opposed arms 32,32 are
integrally connected and extend upwardly from generally diametrically
opposite edges of the circular upper plate 24 and terminate at radially
outwardly turned mounting pads 34,34. The mounting pads are disposed
within a common plane and define threaded apertures 35,35 for receiving
fasteners 36,36 shown in FIG. 2 and used to install the above-floor
service fitting 12 on the through-floor fitting 14.
The frame 16 may be made from any suitable material but preferably it is
formed from sheet metal of substantially uniform thickness and has a
generally rectangular bottom wall 37 which defines spaced apart power
supply and low voltage openings, indicated respectively at 38 and 40. A
pair of key slots 42,42 formed in the bottom wall at diametrically
opposing sides of the low voltage opening 40, and best shown in FIG. 1,
receive the fasteners 36,36 which secure the above-floor fitting 12 to a
through-floor fitting such as the Hubbell PT7XC Poke Through or the
illustrated fitting 14. Another set of key slots 44,44 at opposite sides
of the low voltage opening 40 communicate with the latter opening for
receiving fasteners associated with another through-floor fitting such as
the Hubbell PT27 Through-Floor Fitting (not shown) which may be used in
place of the fitting 14. Preferably, and as shown, the low voltage opening
40 is somewhat larger than the power supply opening 38. The power supply
opening 38 will accommodate up to ten (10) No. 12 AWG power wires, whereas
up to four (4) 25 pair telephone cables may be brought up through the low
voltage opening 40 when the device 10 is assembled with a PT7XC
Poke-Through, for example. The bottom wall 37 also has a threaded barrier
mounting aperture 39 and a raised boss 46 which defines another threaded
aperture 48 for receiving an associated grounding fastener. A pair of
apertures 49,49 (one shown) open through the bottom wall 37 near the
opposite ends thereof to receive fasteners for securing the frame 16 to an
associated concrete floor using plastic or lead anchors, as necessary.
A pair of opposing sidewalls 50,50 extend upwardly from the bottom wall 37
and are upwardly and inwardly inclined toward each other. Each sidewall 50
defines a plurality of generally rectangular spaced apart receptacle
openings 52,52 for receiving receptacles of various types as, for example,
duplex, single, telephone/data and furniture feed receptacles. The
illustrated above-floor service fitting 12 has four receptacle openings
52,52 and is particularly adapted to support three power supply
receptacles (not shown) and one low voltage receptacle (not shown).
Threaded fastener receiving openings 54,54 are formed in each sidewall
near opposite ends of each receptacle opening 52 to receive fasteners used
to secure a selected receptacle (not shown) within each receptacle
opening. Additional threaded fastener receiving openings 55,55 are
provided in the sidewalls for receiving fasteners used to secure
receptacle faceplates (not shown) on the frame 16. A pair of integral end
walls 56,56 extend upwardly from and in normal relation to the frame
bottom wall 37. Preferably, and as shown, the end walls 56,56 have a
substantially lower profiles than the sidewalls 50,50 and terminate in
spaced relation to the sidewalls, substantially as shown in FIG. 1. Each
end wall has a pair of threaded cover mounting apertures 57,57 for
receiving cover mounting screws 59,59 and a cylindrical countersunk
aperture 63 for receiving a flat head barrier mounting screw 65 used to
secure the receptacle barrier 18.
The receptacle barrier 18, as shown in FIGS. 1 and 2 has a generally
L-shaped top wall 58, as viewed from above, and is used to isolate the
power supply opening 38 and three of the four receptacle openings 52,52
from the low voltage opening 40 and the one remaining receptacle opening
52 in the frame 16. A pair of end walls 60 and 61 and a plurality of
intersecting dividing walls 62 and 64 depend from the barrier top wall 58.
Openings along opposite sides of the barrier 18 accommodate receptacles to
be mounted within associated receptacle openings 52,52. The receptacle
barrier 18 is secured to the frame 16 by the fastener 65 engaged within a
threaded opening 67 in the barrier end wall 61, as shown in FIG. 3. The
barrier is further secured by a mounting tab 66 integrally secured to the
barrier wall 62. The tab defines a key slot which receives a fastener 68
threadably engaged in the aperture 39.
The upper portion of the barrier 18, as viewed from above in FIG. 2 and
which includes the dividing wall 64, extends along approximately one-half
the length of one of the sidewalls. The lower portion of the barrier,
which includes the dividing wall 62, extends substantially along the
entire length of the other of the sidewalls 50. The receptacle barrier 18
cooperates with the frame 16 and the cover 20 to divide the interior of
the above-floor service fitting 12 into two compartments, one compartment
communicating with three power supply receptacle openings 52,52 and
containing the power supply opening 38 and the other compartment
communicating with the remaining receptacle opening 52, for mounting a low
voltage receptacle or data/communication outlet, and containing that
portion of the bottom wall 37 which includes the low voltage opening 40.
The two separable components 12 and 14 which comprise the poke-through
wiring device 10 may be installed as a unit or, if desired, the
through-floor fitting 14 may be installed in the floor during a
roughing-in stage of construction and the above-floor fitting 12 connected
to it at a later time. The latter option enables the above-floor fitting
to be installed after furniture is in place, thereby reducing risk of
damage to the above-floor fitting by movement of furniture or other heavy
equipment.
If desired, the illustrated above-floor fitting 12 may be enlarged or
expanded to accommodate additional low voltage voice/data receptacles by
ganging it with an auxiliary above-floor service fitting of like kind.
Such a ganged assembly is shown in FIG. 4, wherein the frame 16 is shown
connected to the frame 16a of an adjacent auxiliary above-floor fitting
indicated at 12a. The auxiliary frame 16a is substantially identical in
most respects to the frame 16, previously described, but it does not have
a power supply opening, a low voltage opening and key slots in its bottom
wall. Further, and as best shown in FIG. 5, one end wall 56a has
cylindrical apertures 70 for registry with the threaded apertures 57,57 in
the adjacent wall 56 to receive fasteners 72 for retaining the frames 16
and 16a in end-to-end in-line relation to each other. The frame 16a
provides additional receptacle openings 52a,52a to accommodate additional
low voltage data/communication outlets. Since the profile of the end walls
56 and 56a is substantially lower than the profile of the sidewalls 50,50,
the low voltage conductors to be terminated on the auxiliary fitting 12a
may pass from the fitting 12 over the end walls 56 and 56a and into the
fitting 12a. Any unused receptacle opening may be covered by a blank
faceplate of appropriate size (not shown). A cover 20a of suitable length
is provided to envelope both the frame 16 and the auxiliary frame 16a to
complete the expanded above-floor service fitting.
Referring now to FIG. 6, another above-floor service fitting embodying the
present invention is indicated generally by the reference numeral 12b.
Like the previously described fitting 12, the fitting 12b includes a frame
16b, a receptacle barrier 18b and a cover 20b. The receptacle barrier 18b
is adapted to isolate from a low voltage opening 40b formed in the bottom
wall 37b, a power supply opening 38b and four receptacle openings 52b,52b
for receiving power supply receptacles.
The frame 16b is substantially similar to the frame 16 previously
described, but, as shown, is of indeterminate length. Thus, the frame 16b
may have receptacle openings for accommodating six, eight or more
receptacles or outlets. Four of the receptacle openings 52b,52b constitute
power supply receptacle openings and are isolated from the remaining
receptacle openings by a barrier 18b.
The receptacle barrier 18b, best shown in FIG. 7, has a U-shaped top wall
58b, as viewed from above in FIG. 6, and dividing walls 62b,62b and 64
which depend from the top wall. A portion of the barrier 18b extends
transversely of the frame 16b between the frame side walls between a pair
of opposing receptacle openings 52b,52b. The depending wall 64b extends
between and separates a power supply opening 38b from a low voltage
opening 40b. Portions of the U-shaped receptacle barrier 18b, extend
longitudinally of the frame 16b, substantially as shown, and separate the
power supply opening 38b and four of the receptacle openings 52b,52b from
the low voltage opening 38b. The receptacle barrier 18b is open along its
opposite sides, as best shown in FIG. 7, to accommodate four power supply
receptacles which may be mounted on the frame 16b. The barrier 18b is
secured to the frame 16b in the same manner that the barrier 18 is secured
to the frame 16 previously described. A cover 20b of suitable size
completes the assembly.
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